Lamont-Doherty Earth Observatory, Department of Earth and Environmental Sciences, Columbia University, Palisades, New York 10964 USA.
Am J Bot. 2001 Dec;88(12):2252-8.
Lythrum salicaria (purple loosestrife) is a nonindigenous invasive species characterized by prolific growth and abundance in marshy and riparian habitats across North America. Given its invasive success, we hypothesized this species may require less energy and/or use energy more efficiently for biomass construction than co-occurring noninvasive plant species. We measured leaf construction cost (CC), leaf mass per unit area (LMA), and leaf organic nitrogen and carbon content of L. salicaria and the five most abundant co-occurring species, Parthenocissus quinquefolia, Erigeron philadelphicus, Asclepias syriaca, Spiraea latifolia, and Solidago graminifolia, along dammed ponds in the Black Rock Forest, Cornwall, New York, USA. Lythrum salicaria, which was highly abundant (2.52 individuals/m(2)), exhibited significantly lower area-based leaf CC (44.47 ± 4.24 g glucose/m(2) leaf) than relatively less abundant species, suggesting energetics may influence its invasive success. Conversely, least abundant Solidago graminifolia (0.67 individuals/m(2)) exhibited the significantly highest leaf CC per unit leaf area (141.87 ± 39.21 g glucose/m(2) leaf). Overall, a negative correlation between species abundance and area-based leaf CC (r(2) = 0.73) indicated low energy requirements and/or high energy efficiency may influence relative abundance in the plant species studied. As it correlates with species abundance in this study, CC may be a useful tool for evaluating invasive potential.
千屈菜（紫色菫菜）是一种非本土入侵物种，其特点是在北美沼泽和河岸栖息地大量繁殖和丰富。鉴于其入侵的成功，我们假设该物种在构建生物量时可能需要较少的能量，或者比共同存在的非入侵植物物种更有效地利用能量。我们测量了千屈菜和五种最常见的共存物种（五叶地锦、三叶鬼针草、北美鹅掌楸、美丽胡枝子和一枝黄花）的叶片构建成本（CC）、单位面积叶片质量（LMA）和叶片有机氮和碳含量，这些样本来自美国纽约州康沃尔的黑岩森林的堤坝池塘。千屈菜（2.52 株/平方米）高度丰富，其基于面积的叶片 CC（44.47 ± 4.24 克葡萄糖/平方米叶片）明显低于相对较少的物种，这表明能量学可能影响其入侵的成功。相反，最不丰富的一枝黄花（0.67 株/平方米）的单位叶面积叶片 CC 最高（141.87 ± 39.21 克葡萄糖/平方米叶片）。总的来说，物种丰度与基于面积的叶片 CC 之间存在负相关（r² = 0.73），这表明低能量需求和/或高能效可能会影响研究中植物物种的相对丰度。由于 CC 与本研究中的物种丰度相关，因此 CC 可能是评估入侵潜力的有用工具。
